625401405 has 20 divisors (see below), whose sum is σ = 1121090652. Its totient is φ = 333547200.

The previous prime is 625401391. The next prime is 625401419. The reversal of 625401405 is 504104526.

625401405 is a `hidden beast` number, since 6 + 254 + 0 + 1 + 405 = 666.

It is an interprime number because it is at equal distance from previous prime (625401391) and next prime (625401419).

It can be written as a sum of positive squares in 2 ways, for example, as 212051844 + 413349561 = 14562^2 + 20331^2 .

It is not a de Polignac number, because 625401405 - 2⁵ = 625401373 is a prime.

It is a super-2 number, since 2×625401405² = 782253834751948050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 771696 + ... + 772505.

Almost surely, 2^625401405 is an apocalyptic number.

It is an amenable number.

625401405 is a deficient number, since it is larger than the sum of its proper divisors (495689247).

625401405 is a wasteful number, since it uses less digits than its factorization.

625401405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1544218 (or 1544209 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 625401405 is about 25008.0268114060. The cubic root of 625401405 is about 855.1709722723.

The spelling of 625401405 in words is "six hundred twenty-five million, four hundred one thousand, four hundred five".